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Stock-based Compensation - Restricted Stock Unit Activity (Details) $ / shares in Units, $ in Millions	6 Months Ended
	Jun. 30, 2021 USD ($) $ / shares shares
Weighted-Average Grant Date Fair Value
Unrecognized compensation expense recognition period	2 years 8 months 12 days
Restricted Stock Units
Shares
Beginning Balance (in shares)	209,250
Granted (in shares)	10,500
Exercised (in shares)	(7,500)
Forfeited or expired (in shares)	(17,400)
Ending Balance (in shares)	194,850
Weighted-Average Grant Date Fair Value
Beginning Balance (in dollars per share) | $ / shares	$ 15.92
Granted (in dollars per share) | $ / shares	29.17
Exercised (in dollars per share) | $ / shares	23.68
Forfeited or expired (in dollars per share) | $ / shares	15.32
Ending Balance (in dollars per share) | $ / shares	$ 16.39
Awards granted in period (in shares)	10,500
Total unrecognized compensation cost | $	$ 0.8
Unrecognized compensation expense recognition period	1 year 3 months 18 days

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Weighted-average period over which cost not yet recognized is expected to be recognized for award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

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The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period.

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Weighted average fair value as of the grant date of equity-based award plans other than stock (unit) option plans that were not exercised or put into effect as a result of the occurrence of a terminating event.

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